Apply goto to reduce lines and nesting levels.
Cc: Daniel Lezcano <daniel.lezc...@linaro.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Nicolas Pitre <nicolas.pi...@linaro.org>
Signed-off-by: Peter Zijlstra <pet...@infradead.org>
---
kernel/sched/idle.c | 138 +++++++++++++++++++++++-----------------------------
1 file changed, 62 insertions(+), 76 deletions(-)
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -73,7 +73,7 @@ static int cpuidle_idle_call(void)
{
struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
- int next_state, entered_state, ret;
+ int next_state, entered_state;
bool broadcast;
/*
@@ -102,90 +102,64 @@ static int cpuidle_idle_call(void)
* Check if the cpuidle framework is ready, otherwise fallback
* to the default arch specific idle method
*/
- ret = cpuidle_enabled(drv, dev);
+ if (cpuidle_enabled(drv, dev))
+ goto use_default;
- if (!ret) {
- /*
- * Ask the governor to choose an idle state it thinks
- * it is convenient to go to. There is *always* a
- * convenient idle state
- */
- next_state = cpuidle_select(drv, dev);
-
- /*
- * The idle task must be scheduled, it is pointless to
- * go to idle, just update no idle residency and get
- * out of this function
- */
- if (current_clr_polling_and_test()) {
- dev->last_residency = 0;
- entered_state = next_state;
- local_irq_enable();
- } else {
- broadcast = !!(drv->states[next_state].flags &
- CPUIDLE_FLAG_TIMER_STOP);
-
- if (broadcast) {
- /*
- * Tell the time framework to switch
- * to a broadcast timer because our
- * local timer will be shutdown. If a
- * local timer is used from another
- * cpu as a broadcast timer, this call
- * may fail if it is not available
- */
- ret = clockevents_notify(
- CLOCK_EVT_NOTIFY_BROADCAST_ENTER,
- &dev->cpu);
- }
-
- if (!ret) {
- trace_cpu_idle_rcuidle(next_state, dev->cpu);
-
- /*
- * Enter the idle state previously
- * returned by the governor
- * decision. This function will block
- * until an interrupt occurs and will
- * take care of re-enabling the local
- * interrupts
- */
- entered_state = cpuidle_enter(drv, dev,
- next_state);
-
- trace_cpu_idle_rcuidle(PWR_EVENT_EXIT,
- dev->cpu);
-
- if (broadcast)
- clockevents_notify(
- CLOCK_EVT_NOTIFY_BROADCAST_EXIT,
- &dev->cpu);
-
- /*
- * Give the governor an opportunity to reflect
on the
- * outcome
- */
- cpuidle_reflect(dev, entered_state);
- }
- }
- }
+ /*
+ * Ask the governor to choose an idle state it thinks
+ * it is convenient to go to. There is *always* a
+ * convenient idle state
+ */
+ next_state = cpuidle_select(drv, dev);
/*
- * We can't use the cpuidle framework, let's use the default
- * idle routine
+ * The idle task must be scheduled, it is pointless to
+ * go to idle, just update no idle residency and get
+ * out of this function
*/
- if (ret) {
- if (!current_clr_polling_and_test())
- arch_cpu_idle();
- else
- local_irq_enable();
+ if (current_clr_polling_and_test()) {
+ dev->last_residency = 0;
+ entered_state = next_state;
+ local_irq_enable();
+ goto exit_idle;
}
+ broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP);
+
+ /*
+ * Tell the time framework to switch to a broadcast timer
+ * because our local timer will be shutdown. If a local timer
+ * is used from another cpu as a broadcast timer, this call may
+ * fail if it is not available
+ */
+ if (broadcast &&
+ clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu))
+ goto use_default;
+
+ trace_cpu_idle_rcuidle(next_state, dev->cpu);
+
+ /*
+ * Enter the idle state previously returned by the governor decision.
+ * This function will block until an interrupt occurs and will take
+ * care of re-enabling the local interrupts
+ */
+ entered_state = cpuidle_enter(drv, dev, next_state);
+
+ trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
+
+ if (broadcast)
+ clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
+
+ /*
+ * Give the governor an opportunity to reflect on the outcome
+ */
+ cpuidle_reflect(dev, entered_state);
+
+exit_idle:
__current_set_polling();
/*
- * It is up to the idle functions to enable back the local
- * interrupt
+ * It is up to the idle functions to reenable local interrupts
*/
if (WARN_ON_ONCE(irqs_disabled()))
local_irq_enable();
@@ -194,6 +168,18 @@ static int cpuidle_idle_call(void)
start_critical_timings();
return 0;
+
+ /*
+ * We can't use the cpuidle framework, let's use the default idle
+ * routine
+ */
+use_default:
+ if (current_clr_polling_and_test())
+ local_irq_enable();
+ else
+ arch_cpu_idle();
+
+ goto exit_idle;
}
/*
--
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